Given a linear matrix pencil $M = I_d + x_1A_1 + ... + x_nA_n$, this method returns the list of matrices $A_1, ..., A_n$.
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This method does not return the constant term, or coefficients of terms of degree $> 1$.
The object coeffMatrices is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/DeterminantalRepresentations.m2:1184:0.